2results about "Motor control for high speed" patented technology

The invention relates to a method for operating an electric drive device (1) that comprises an electrical machine (2), power electronics (3) comprising half-bridges having multiple semiconductor switches and an intermediate circuit (5) and that is connected or connectable to an electrical energy store (4), wherein an operating state of the electrical machine (2) and a demanded target torque of the electrical machine (2) are taken as a basis for switching the semiconductor switches to a normal mode for generating the target torque, to a short-circuit mode or to a freewheeling mode. There is provision for a present operating value of the electrical machine (2), which corresponds to a magnetic field weakening of a magnetic field of the electrical machine (2), to be measured and for the freewheeling mode to be enabled or disabled on the basis of the operating value.

The application relates to the technical field of motor control, and discloses a voltage self-adaptive control method for an 800V high-voltage platform new energy vehicle motor. The method comprises the steps of parameter initialization, multi-sensor data acquisition and verification, loss coordination optimization, working condition self-adaptive modulation, drive signal generation and closed-loop optimization; by establishing a SiC MOSFET junction temperature-loss quantitative relationship, dynamically adjusting the switching frequency and the dead time, combining the working condition grading modulation and the harmonic suppression technology, the voltage self-adaptive control is realized. The application makes the inverter efficiency greater than or equal to 98.5%, the current harmonic distortion rate THD less than or equal to 5%, and the system operation fluctuation rate less than or equal to 2%, effectively solves the problems of low efficiency and power attenuation in the prior art, and is suitable for efficient and stable control of the 800V high-voltage platform new energy vehicle motor.